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bbbb bbbs bbhs bffs bfhs bfsi bfsr bfts bftt bhff bhhs bhir bhit bhrt bhsf bhur bhut bhuu bibb bibi bibs biff bifi bihi bihs bihu biis birb biri birr birs birt biru bis- bish biss bist bisu bith bits bitt bitu brfu brhs brih bris brit brrr brrs brsb brsr brst bruh brus brut bsff bsfs bshs bsts bths btrt btss bttb btus bubb bubi bubs bubu buff bufr buhi buhr buhs buif buir buis buit buiu bur- burb burh buri burr burs burt buru bush busi buss bust busu but- buti buts butt buus fbhs fbis fbrs fbus ffff ffhs ffii ffrr ffss fftf fhfs fhhs fhit fhrs fhss fibs fiff fifi fift fiii firs fish fisi fiss fist fisu fiti fits fitt frhs frib fris frit frsb frst frub fsfi fshb fshs fssf fths ftii ftrs ftsr ftub fubb fubs fubu fuff fufu fuhs fuir fuit fur- furi furr furs furt fusi fuss fust fusu futi futs futu h-ii hbbs hbhs hbit hbrs hbss hbtu hfhs hfrs hfss hhhh hhhs hhus hibi hibt hibu hiff hifh hifi hifr hihi hiht hiis hiit hiiu hirf hiri hirs hirt hiru hisb hish hiss hist hiti hits hitt hrhs hrib hrit hrtb hsfs hshs hsts hsur hths httr hubb hubi hubs huff hufs hufu huhi huhs huhu huib huif huir huis huit huri hurr hurs hurt huru hush husi huss hust huth huti huts hutt hutu huub huus ibfi ibis ibri ibsf ibss ibtb ibts ibus ifbb ifht ifis ifit ifrb ifrf ifri ifsb ihis ihit ihss ihub iiht iiii iiis iiit iirs iisi iisr iist iisu iitr iitt irfu irhs iri- iris irri irrs irsf irtf irti irts irus isbt ishi ishr ishs isis isit isri issf issh issi issr isss issu isth isti istr ists isuh isus itbs iths itif itis itrf itri itrs itsf itsi itsu ittf itur iuiu iuss iust rbbb rbbr rbbs rbhs rbis rbss rbst rfhs rhfs rhhs rhib rhus rib- ribs ribu riff rifs rift rifu rihs riht riif riis riri rirs rish risi riss rist risu rith riti rits ritt ritu rius rrhs rrif rrrr rsbi rshs rsis rsts rstu rtbf rtfb rths rtss rtts rubb rubi rubs rubu ruff ruft ruhh ruhi ruhr ruhs ruif ruis ruit ruri rurs ruru rush rusi russ rust rusu ruth ruti ruts rutt rutu s-ib s-ii sbbs sbhs sbsi sbst sbus sfhs sfss sfsu sfts shbs shbt shft shhh shhs shib shih shii shir shis shit shiu shri shrs shts shub shuf shui shur shus shut shuu sibi sibs sibu siff sifr sift sifu sihi sihr sihs siht sihu siit sirf siri sirr sirs sirt siru sish sisi siss sist sisu sit- sith siti sits sitt situ siui sius siut srfi srhs srib sris srtr srub ssbr sshs ssis ssit ssri ssrs sssb sssf sssh sssi ssss sstb ssth ssts stbs stfu sths stib stif stih stir stis stit stri strs stru stsf stsi stss sttr stub stuf stur